Like the topic title states, I am looking for a romance where the girl and boy used to date then break up, can be for any reason. They meet up years later and dislike one another or are at different points in thiers lives. I saw a movie recently called My Girlfriend is an Agent http://asianmediawiki.com/My_Girlfriend_is_an_Agent. It was awesome and I would like to read a manga with this concept, not necessarily the spy part. Any ideas?

Sunadokei
Bokura ga Ita - didn't really break up when they split but...you'll find out, saying too much would be a spoiler

Haru yo, koi

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Cherish

Though the story is only 3 chapters long

It aint a manga but ur description reminded me of a movie, quite good actually; Eternal sunshine of the spotless mind http://www.imdb.com/title/tt0338013/